After returning from the first quest the governor Feldril Sathis sends you in and talking to him about the topic "sealed letter to S'Vosh", this error occurs:

Expression Error Unable to find faction "5" in script TR_m7_NPC_Feldril_Sathis.

And then another error:

==>CompileAndRun Init problem was found in Topic "sealed letter to S'Vosh" "S'@Vos#h has received my @orders#? @Good#. Thank you, %PCRank. Let's @talk# about some more @business#."

It's impossible to complete the quest and continue the questline because of it.